Coating liquid for forming organic layer in organic LED display and method of manufacturing organic LED display

Patent 6720029 Issued on April 13, 2004. Estimated Expiration Date:

October 18, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Stabilization of polyaniline solutions through additives
Patent #: 5583169
Issued on: 12/10/1996
Inventor: Wrobleski, et al.

Organometallic fluorescent complex polymers for light emitting applications
Patent #: 5681659
Issued on: 10/28/1997
Inventor: Shi, et al.

Ink jet inks containing long chain alcohols
Patent #: 5688311
Issued on: 11/18/1997
Inventor: Adamic

Method of preventing clogging of nozzles
Patent #: 5781214
Issued on: 07/14/1998
Inventor: Vonasek, deceased, et al.

Electrically active polymer compositions and their use in efficient, low operating voltage, polymer light-emitting diodes with air-stable cathodes Patent #: 6284435
Issued on: 09/04/2001
Inventor: Cao

Inventors

Application

No. 10272935 filed on 10/18/2002

US Classes:

427/157, FLUORESCENT OR PHOSPHORESCENT COATING252/500, ELECTRICALLY CONDUCTIVE OR EMISSIVE COMPOSITIONS252/501.1, Light sensitive252/301.16ORGANIC LUMINESCENT MATERIAL CONTAINING COMPOSITIONS

Examiners

Primary: Kopec, Mark

Attorney, Agent or Firm

Nixon & Vanderhye P.C.

Foreign Patent References

10-012377 JP 01/01/1998
10-153967 JP 06/01/1998
11-054270 JP 02/01/1999
11-054272 JP 02/01/1999
11-074076 JP 03/01/1999

International Classes

B05D 512
H01B 120

Claims

What is claimed is:

1. A method of manufacturing organic LED display including ink jet forming a light emitting organic layer, the method comprising:

providing a coating liquid comprising (a) an organic material having at least one of conductivity and fluorescence, and (b) at least one low volatile liquid solvent having a vapor pressure of 10 mmHg of less at 20° C. and a boiling point lower than a denaturing temperature of the organic material and wherein the low volatile liquid solvent has a boiling point lower than the melting point of the organic material;

ink-jet discharging the liquid by an ink-jet technique to form at least one film, and

heat drying the film at a temperature not lower than the boiling point of a low volatile liquid solvent contained in the coating liquid, thereby forming the organic layer.

2. A method according to claim 1, wherein the heat drying is performed at a temperature lower than the denaturing temperature of the organic material.

3. A method according to claim 1, wherein, in the case where the organic LED display includes two organic layers of organic materials contacting each other and at least one of the organic layers is formed by the ink-jet technique, the heat drying is performed at a temperature lower than the higher one of the melting points of the two organic materials of the organic layers.

4. A method according to claim 1, wherein, in the case where the organic LED display includes three or more organic layers of organic materials and at least one of the organic layers is formed by the ink-jet technique, the heat drying is performed at a temperature lower than the lowest one among the higher ones of the melting points of the organic materials of all pairs of two contacting layers.

5. A method of manufacturing an organic LED display including ink-jet forming an organic layer of the LED display, wherein the organic layer includes at least a light emitting layer, the method comprising:

providing a coating liquid comprising a precursor of an organic material having conductivity and/or fluorescence for forming the organic layer, and at least one low volatile liquid solvent having a vapor pressure of 10 mmHg of less at 20° C. and a boiling point lower than a converting temperature of the precursor of the organic material, and

wherein the low volatile liquid solvent has a boiling point lower than the melting point of the organic material,

discharging the coating liquid by an ink-jet technique to form at least one film, and

heat drying the film at a temperature not lower than the boiling point of a low volatile liquid solvent in the coating liquid, thereby forming the organic layer.

6. A method according to claim 5, wherein the heat drying is performed at a temperature of lower than the converting temperature of the precursor of the organic material.

7. A method according to claim 5, wherein the heat drying is performed at a temperature lower than the denaturing temperature of the organic material.

8. A method according to claim 5, wherein, in the case where the organic LED display includes two organic layers of organic materials contacting each other and at least one of the organic layers is formed by the ink-jet technique, the heat drying is performed at temperature lower than the higher one of the melting points of the two organic materials of the organic layers.

9. A method according to claim 5, wherein, in the case where the original LED display includes three or more organic layers of organic materials and at least one of the organic layers is formed by the ink jet technique, the heat drying is performed at a temperature lower than the lowest one among the higher ones of the melting points of the organic materials of all pairs of two contacting layers.

Other References

The 59th Science Lecture of Appl. Phys. Soc., 16p-YH-15 “Fabrication of Organic Electroluminescent Devices by Direct Ink-Jet Printing Method” Toyama University K. Yyoshimori et al.
Appl. Phys. Letters. vol. 72, No. 21, pp. 2660-2662, May 1998 “Polymer Electroluminescent Devices Processed by Inkjet Printing: I. Polymer Light-Emitting Logo” J. Bharathan et al.
Bharathan et al., “Polymer Electroluminescent Devices”, Appl. Phys. Lett. vol. 72, No. 21, pp 2660-2662, May 1998.